Tire-deflation signal



Apr. 3, w23. i 31,450,769

' R. A. CRQSBY TIRE DEFLATION SIGNAL Filed Apr. 1'7 1922 i?, H, Cmom;

attoznag Patented Apr.; 3, l111523.

Leave@ RAYMOND A. CROSBY, F IHOLYOKE, COLORADO.

TIRE-DEFLATION SIGNAL'.

i Application led April 17, 1922. Serial No. 553,518.

To all 'whom t may concern:

, Be 1t known that I, RAYMOND A. CROSBY, a cltizen 'of the UnitedStates, residing at y Holyoke, in the county of Phillips and State ofColorado, have invented certain new and useful Improvements inTire-Deflation Sig-' nals; and I do hereby declare 'the followin to afull, clear, and exact description 0% the 1nvention,`such as will enableothers skilled in the art to which it -appertains to make and use thelsame.

The present invention relates to signal devices for pneumatic tires, andaims to provide a novel and improved device for produclng an audiblesignal when the' tire becomes del-lated a certain amount, therebyWarning the driver, in order that the `tire can be inflated, replaced orre aired, to avoid runnin on a dat or under-inflated tire.

vision of a simple and efficient device for attachment-to the valve stemof a pneumaticY A further object to provide a n'ovel dust cap for thesignal device tol Vprevent dust,

. dirt, water and other foreign' matter from entering the device andvalve stem., and which cap is `automatically displaced from over theopening of the whistle, when the air is allowed to escape through thevalve 35 stem, in order ythat the Whistle can be heard.

It .is also an object ofthe invention to provide such a devicecomprising a compactl and novel aemblage of the component elements, toenhance the utility and efliciency thereof.

With the fore oing and other ob'ects in view, which will apparent as thedescription proceeds, the invention resides in the construction andarrangement of parts, as hereinafter described and claimed, it beingunderstood that changes can be made within the scope of what is claimed,without departingfrom the spirit of the invention. he invention isillustrated in the accomf to lpanying drawing, wherein- A Figure 1 is anenlarged elevation of the device as applied on a valve stem.. Fig. 2 isa longitudinal section on the line 2-2 of Fig. 1.

Anot er object of the invention is'the pro- 'coiled expansion guide 2Oand is co ned between the lug 12 we Fig. 3 is a cross section on theline 3-3 of Fig. 2.'

The signal device comprises a tube 7 of suitable metal, ,which isinteriorly screwthreaded and smooth on the exterior. lOne end of thetube is screw-threaded onthe tip 8 of the valvestem 9, and a lock nut 10is also threaded 'om thetip of the valve stem to abut the end of the.tube 7 for locking the tube in place. The nut 10 is of larger diametertham the tube, to be conveniently @5 rotated by hand when the tube 7 has,been adjusted. A

The other-end of the tube is closed by a'. plug 11 screw-threadedthereinto, and a plug 12 is threaded into the tube and located betweenthe ends thereof. The portion of the tube between the plugs 11 and 12constitutes a' whistle, and the tube is provided at one side with awhistle opening 13 adjacent to the plug 12. One side of the plug 12 isflattened, as at 14, to provide a passage 15 for the air leading to theopenin 13, whereby the air in passing through sal passage adjacent tothe opening 13, will create a whistling noise that can be heard by thedriver of the vehicle.

The tubular valve stem 9, is provided, as usual, with a check valve 16on a rod 17 t which` extends loosely through the valve seat 18 which isscrew-threaded into the tip 8 v85 of the valve stem, and the valve 16 isseated under the tension of a spring 19, as well known.

The signal device includes spring-actuated means for opening the valve16 when the air pressure in the tire is reduced to a predeter vminedamount. Thus, a tubular guide 20 has one end screw-threaded into theplug 12o posite to the whistle portion of the tube and the other end ofthe ide is con- @5 tracted, as at 21. A rod 22 is slidable in thecontracted portion 21, and has a head or enp largement 23 slidable inthe guide. 20, thereby guiding the' rod 22 for lon `tud1nal movement andretaining it assemb ed. with the other parts. The projecting end of therod 22 has a socket portion 24 to engage over the louter end of thevalve rod 17. A ring 25 surrounds the and socket portion 24, whereby toyie di l ly move the rod 22 toward the end of the tu w 7 which isengaged on the valve stern. The

guide 20, rod 22 and spring 25 are carried as a unit bythe plug 12 foradjustment or removal with the plu A Adust'cap 26 o inflatable rubber isfitted 4on the tube 7, and has a bead 27 at its open-end to snuglyembrace the tube 7. In applying the signal device to the valve stem, theopen end of the tube 7 is screwed on Ithe tip 'of the valve' stem, thenut 10 having been previously threaded on sald tip,

and when the tube 7 is screwed into place,-

portion 24 of the spring-pressed l the socket rod 22 Wi eng e the outerend of the valve rod 17, there y bringing the spring 25 under thecompression, so that said spring tends to slide the rod 17 into thevalve stem, for opening'the valve 16, but such opening movement of thevalve 16 is normally prevented by the-preponderance of air pressure fromwithin the tire, overcoming the effort of the spring 25. AThe dust cap-26 being fitted over thetube 7, will close the whistle opening 13, t0prevent foreign matter fromv enterin the tube 7.

Should the tire become deflated down to a predetermined pressure, sothat the force of the spring 25 overcomes the pressure of the airagainst the valve 16, thespring 25 will assert itself and open the valve16,

thereby permitting the air to escape, from- .the tire throu h the valvestem and into the tube 7. he vair assing through the passage 15' and outthrough thel opening 13, will inflate orblow up the cap 26, and the bead27 will remain close around the tube 7. The air accumulating within theAinflated cap 26 will cause the cap Ato be 'blown outwardly at leastpartly oii the tube 7, until the bead 27 has' moved past the opening 13.This automatically opens the dust cap to expose the opening 13, wherebythe airin escaping will blow the whistle and give the warmngsignal. Thetire canth'en spring-pressed means carried as a unit by theA plug foradjustment therewith, to engge and bear lagainstthe valve rod in said 2.A tire delationysignal' comprising a tube to be engagedxon a valve stemof a tire, av lug in thel tube between the ends thereof aving-an'airpassagathe tube having a -whistle opening, a rod having a slidableconnection-with lthe plug and a portion to engage a valve rodin saidstem, and a coiled spring surrounding the rod 'and 00.11.q

surrounding said guide and conline a plug in the tube providing an jai'rpassage, A

the tube having a whistle opening, a tubular guide carriedl by said plugand projecting toward one end of the tube, a rod slidable in saidguide-and havinga portion to engage a' valve yrod in said stem, and acoiled spring surrounding -said guide and confined between said ortionand plug, said guide, rod and spring eing carried as a unit by the plug.

4. A tire deiiation signal comprislng a tube, one end of which isengageable over a valve stem of a tire, a plug in the tubeprowhistleopening, a tubular guide secured to the plug and projecting toward saidend of the tube, the end of the guide opposite to the plug beingcontracted, a rodslidable through said contracted end of the guide andhaving an enlargement slidable in said -viding an air passage, the tubehaving 'a guide, the projecting portion of the rod havmg -a portion tobearl against the end of a valve rod in said stem, and a coiled sritlieg tween said 'plug and the last named portion of said rod.

5. A tire deflation signal comprising a whistle tube for connection witha 4valve stem,.having a Whistle opening, and arrelsilient'dust capfitted for sliding movement over said tube to close said opening andadapted to be inflated and slid partly ofi'v said tube to uncover-saidopening.

6. A tire deliation signal comprising' a whistle tube having a .whistleopening at one side, and -a resilient dust cap fitted forAslidingmovement over said tube to close said opening and adapted to beinflated by airpassing throughsaid opening for sliding the cap at leastpartly oii' the tube to uncover said opening. i 7. A tire deation signalcomprising a whistle tube for connection with fa valvel 'i stem of -atire andphav-ing a-whistle open' ing at one side, means for opening thevvalve of lsaid stemwhen the pressure becomes low, and resilient `dustcap fitted for sliding' movement over said tube to cover said openlng,and having -a bead at its open end `ernbracing the tube, said cap beingv inflated by air paping through said opening `for slid- 1ng e the bead.moved past said opening.j

'In testimony whereof I` have signed my name to this specification inthe' presence of two'subscribing'witnes'ses. lf RAYMOND A. CROSBY.Witnesses: e

A.'G. W. J. F ULscHER.

cap at least partly off 'the tube with

